HappyHour map is a deserted English Pub in the middle of nowhere called 'The Tortured Soul' inspired by the person who created Killing Floor.
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Usual Installation of KF-HappyHour.rom (the Game Map File):
Program Files / Steam / Steamapps / Common / KillingFloor / Maps / KF-HappyHour.rom
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HappyHour, ported and modified from the KF mod. Uploaded on behalf of thesnipe34.